JP6881275B2 - Oil supply device for in-vehicle internal combustion engine - Google Patents

Description

The present invention relates to an oil supply device for an in-vehicle internal combustion engine.

Patent Document 1 describes an example of an oil jet that cools a piston of an internal combustion engine by injecting oil toward the piston. A solenoid valve for adjusting the amount of oil supplied to the oil jet is provided in the supply passage for supplying oil to the oil jet. Then, the amount of oil injected from the oil jet is adjusted by controlling the opening degree of the solenoid valve based on the fuel injection amount of the fuel injection valve in the internal combustion engine, the temperature of the piston, and the engine rotation speed.

By the way, the internal combustion engine is provided with an oil supply device that supplies oil to a place where oil needs to be supplied, such as an oil jet. As such an oil supply device, one having an engine-driven oil pump capable of varying the discharge pressure of oil is known (for example, Patent Document 2). The oil pump described in Patent Document 2 is a trochoidal pump. Such an oil pump can control the oil discharge pressure by adjusting the internal pressure of the control oil chamber formed inside the pump.

Japanese Unexamined Patent Publication No. 2014-5806 Japanese Unexamined Patent Publication No. 2014-159760

In an internal combustion engine equipped with the above oil supply device, when it is required to stop the oil injection by the oil jet, the oil discharge pressure of the oil pump is the maximum discharge pressure in order to suppress the deterioration of fuel efficiency. The oil supply may operate to a lower pressure.

The pressure of the oil discharged from the above oil pump pulsates. When the oil discharge pressure is set to a pressure lower than the maximum discharge pressure, the pulsation of the oil discharge pressure tends to be larger than when the oil discharge pressure is set to the maximum discharge pressure. When the pulsation of the oil discharge pressure is large, the components of the internal combustion engine arranged along the discharge flow path through which the oil discharged from the oil pump flows resonate depending on the cycle of the pulsation of the discharge pressure. Abnormal noise may occur due to the pulsation of the discharge pressure. If such an abnormal noise is transmitted to the occupants of the vehicle, it may cause discomfort to the occupants.

Therefore, there is room for improvement in that it is less likely to cause discomfort to the occupants of the vehicle while suppressing deterioration of fuel efficiency of the internal combustion engine.

The oil supply device of an in-vehicle internal combustion engine for solving the above problems is applied to an internal combustion engine equipped with an oil jet that injects oil toward a piston, and the oil discharge pressure is changed by changing the internal pressure of the control oil chamber. It includes an engine-driven oil pump and a control unit that controls the internal pressure of the control oil chamber, and when the control unit is required to stop the oil injection by the oil jet, it is higher than the maximum discharge pressure. This device controls the internal pressure of the control oil chamber so that the discharge pressure of oil in the oil pump is included in the specified pressure region, which is a region of low pressure. In this oil supply device, when the internal pressure of the control oil chamber is controlled so that the discharge pressure of the oil in the oil pump is included in the specified pressure region, an abnormal noise due to the pulsation of the discharge pressure of the oil is generated. It is equipped with an abnormal noise determination unit that determines whether or not it is based on the oil temperature and engine rotation speed. Then, the control unit has the control oil chamber so that the discharge pressure of the oil in the oil pump is included in the specified pressure region even when it is required to stop the injection of the oil by the oil jet. The internal pressure of the control oil chamber is such that the discharge pressure of the oil in the oil pump becomes the maximum discharge pressure, provided that the abnormal noise determination unit determines that the abnormal noise is generated when the internal pressure of the oil pump is controlled. To control.

As a result of repeating various experiments and simulations, the inventor of the present application has obtained the following findings.
-The region of the discharge pressure that causes abnormal noise due to the pulsation of the discharge pressure when the discharge pressure of the oil in the oil pump is lower than the maximum discharge pressure is determined by the temperature of the oil and the engine rotation speed.
-When the oil discharge pressure in the oil pump is set to the maximum discharge pressure, the above-mentioned abnormal noise is unlikely to occur regardless of the oil temperature and engine speed.

Therefore, in the above configuration, it is determined whether or not an abnormal noise is generated when the discharge pressure of the oil in the oil pump is set to a value within the specified pressure region, based on the temperature of the oil and the engine rotation speed. Then, when it is determined that the above abnormal noise is generated when the discharge pressure of the oil in the oil pump is set to a value within the specified pressure region under the situation where the stop of the oil injection by the oil jet is required. The oil discharge pressure in the oil pump is set to be equal to the maximum discharge pressure. As a result, it is possible to suppress the abnormal noise from being transmitted to the occupants of the vehicle.

On the other hand, when it is not determined that the above abnormal noise occurs when the discharge pressure of the oil in the oil pump is set to a value within the specified pressure range, the oil is required to stop the injection of the oil by the oil jet. The oil discharge pressure in the pump is set to a value within the specified pressure range. That is, when it can be determined that the above-mentioned abnormal noise is unlikely to occur even if the oil discharge pressure is set to a value within the specified pressure range, the oil discharge pressure is set to be lower than the maximum discharge pressure.

Therefore, according to the above configuration, it is possible to suppress the deterioration of the fuel efficiency of the internal combustion engine and to reduce the discomfort to the occupants of the vehicle.

The schematic diagram which shows the oil supply apparatus of embodiment, and the internal combustion engine to which the oil supply apparatus is applied. The figure which shows the cross section of the oil pump, and the oil control valve in the oil supply device. The figure which shows the cross section of the oil pump, and the oil control valve in the oil supply device. (A) is a partially enlarged view of FIG. 2, and (b) is a partially enlarged view of FIG. The graph which shows the relationship between the discharge pressure set value and the magnitude of the pulsation of the oil discharge pressure in an oil pump. The graph which shows the relationship between the engine rotation speed, the oil temperature, the discharge pressure of oil in an oil pump, and the region where an abnormal noise is generated. The flowchart explaining the processing routine executed by the control device of the oil supply device.

Hereinafter, an embodiment of an oil supply device for an in-vehicle internal combustion engine will be described with reference to FIGS. 1 to 7.
FIG. 1 shows a part of an internal combustion engine 10 mounted on a vehicle and an oil supply device 20 for supplying oil circulating in the internal combustion engine 10. As shown in FIG. 1, the internal combustion engine 10 is provided with a piston 12 that reciprocates in the cylinder 11 and an oil jet 13 that injects oil toward the back surface of the piston 12. A jet valve 15 is provided in the jet supply path 14, which is an oil supply passage to the oil jet 13. The jet valve 15 is configured to open when the pressure of the oil flowing through the jet supply path 14 is equal to or higher than a predetermined pressure, and close when the pressure of the oil is lower than a predetermined pressure. Then, when the jet valve 15 is open, oil is injected from the oil jet 13.

The oil supply device 20 includes an oil pump 30 which is a variable displacement trochoid pump driven based on the rotation of an engine output shaft, an oil control valve 21 which operates to adjust an oil discharge pressure POP in the oil pump 30. It is provided with a control device 60 that controls the operation of the oil control valve 21.

The oil pump 30 will be described with reference to FIGS. 1 to 3.
As shown in FIGS. 2 and 3, the oil pump 30 includes an input shaft 31 that rotates in synchronization with the engine output shaft, and a casing member 33 in which a storage space 32 is partitioned therein. The accommodation space 32 is provided with an inner rotor 34 that rotates integrally with the input shaft 31, an outer rotor 35 that is arranged on the outer peripheral side of the inner rotor 34, and a ring-shaped adjusting ring 36 that surrounds the outer rotor 35.

As shown in FIG. 1, the casing member 33 is provided with a suction port 33IN for sucking oil inside the casing member 33 and a discharge port 33OUT for discharging the oil inside the casing member 33 to the outside. The suction port 33IN communicates with the suction oil passage 51 leading to the oil pan 16 of the internal combustion engine 10, and the discharge port 33OUT communicates with the discharge oil passage 52 leading to the main oil gallery 17. A jet supply path 14 is connected to the discharge oil passage 52.

As shown in FIGS. 2 and 3, a plurality of external teeth 341 are provided on the outer circumference of the inner rotor 34, and a plurality of internal teeth 351 that mesh with the external teeth 341 of the inner rotor 34 are provided on the inner circumference of the outer rotor 35. Has been done. The number of internal teeth 351 is one more than the number of external teeth 341. The outer rotor 35 is rotatably held by the adjusting ring 36.

The center of rotation of the outer rotor 35 is eccentric with respect to the center of rotation of the inner rotor 34. The outer teeth 341 of the inner rotor 34 and the inner teeth 351 of the outer rotor 35 are in a state in which a part thereof (the right side portion in FIG. 2) is in mesh with each other. An operating chamber 37 filled with oil is formed between the outer circumference of the inner rotor 34 and the inner circumference of the outer rotor 35.

In the operating chamber 37, from the position where the outer teeth 341 of the inner rotor 34 and the inner teeth 351 of the outer rotor 35 mesh with each other to a predetermined position in the rotation direction of the input shaft 31 indicated by the arrow in FIG. As the rotation occurs, the gap between the outer teeth 341 of the inner rotor 34 and the inner teeth 351 of the outer rotor 35 gradually increases. Then, the portion where the gap between the outer teeth 341 of the inner rotor 34 and the inner teeth 351 of the outer rotor 35 gradually increases communicates with the suction port 33IN. On the other hand, in the operating chamber 37, a portion where the gap between the outer teeth 341 of the inner rotor 34 and the inner teeth 351 of the outer rotor 35 gradually becomes smaller as the rotors 34 and 35 rotate, communicates with the discharge port 33OUT.

When the oil pump 30 operates, the input shaft 31 rotates, so that the rotors 34 and 35 rotate while meshing with each other. Then, the oil stored in the oil pan 16 is sucked into the operating chamber 37 from the suction port 33IN via the suction oil passage 51, and is discharged from the discharge port 33OUT to the discharge oil passage 52.

The adjusting ring 36 has a ring-shaped main body portion 361 that holds the outer rotor 35, and a protruding portion 362 that protrudes from the outer periphery of the main body portion 361 in the radial direction of the rotors 34 and 35. The main body 361 of the adjusting ring 36 is provided with an elongated hole 36a extending in a specified direction. A guide pin 38 fixed to the casing member 33 is inserted through these elongated holes 36a. As a result, the adjusting ring 36 can be displaced in the extending direction of the elongated hole 36a.

A first sealing member 39 is provided at the tip of the protruding portion 362 of the adjusting ring 36, and a second sealing member 40 is provided at the main body portion 361. As a result, the control oil chamber 41 is partitioned by the adjusting ring 36 and the sealing members 39 and 40 in the accommodation space 32.

The control oil chamber 41 is provided with an opening 411 communicating with the control oil passage 53, and oil can be supplied from the oil control valve 21 to the control oil chamber 41 through the control oil passage 53 and the opening 411. There is. Further, the accommodation space 32 is provided with a spring 42 that applies an urging force to the protrusion 362 in a direction of reducing the volume of the control oil chamber 41. FIG. 2 shows a state in which the adjusting ring 36 is held at a position where the volume of the control oil chamber 41 is minimized by the urging force from the spring 42 because the internal pressure of the control oil chamber 41 is low. In the present embodiment, the position of the adjusting ring 36 when the volume of the control oil chamber 41 is minimized, that is, the position of the adjusting ring 36 in FIG. 2 is referred to as an “initial position”.

Then, in a situation where the adjusting ring 36 is arranged at the initial position, oil is supplied to the control oil chamber 41, and when the internal pressure of the control oil chamber 41 becomes high, it resists the urging force from the spring 42 and the control oil chamber 41. The adjusting ring 36 is displaced from the initial position in the direction of increasing the volume of 41. That is, the adjusting ring 36 is displaced while rotating in the direction from the state shown in FIG. 2 to the state shown in FIG. On the other hand, when the oil is discharged from the control oil chamber 41 through the opening 411 by the operation of the oil control valve 21, the internal pressure of the control oil chamber 41 becomes low, and the urging force from the spring 42 causes the control oil chamber. The adjusting ring 36 is displaced in the direction of reducing the volume of 41. That is, the adjusting ring 36 is displaced while rotating in the direction from the state shown in FIG. 3 to the state shown in FIG. Then, due to the change in the position of the adjusting ring 36, the relative positions of the meshing portions of the teeth 341 and 351 of the inner rotor 34 and the outer rotor 35 with respect to the openings of the suction port 33IN and the discharge port 33OUT change. Therefore, the oil discharge amount per rotation of the input shaft 31, that is, the oil discharge pressure is changed by changing the position of the adjustment ring 36 by adjusting the internal pressure of the control oil chamber 41.

Specifically, in the oil pump 30, when the position of the adjusting ring 36 is in the "initial position" as shown in FIG. 2, the discharge amount of oil per rotation of the input shaft 31 is maximized, that is, oil. Discharge pressure is maximized. Then, when the internal pressure of the control oil chamber 41 becomes high, the adjusting ring 36 is displaced so that the volume of the control oil chamber 41 becomes large. As a result, in the portion where the gap between the outer teeth 341 and the inner teeth 351 gradually increases as the rotors 34 and 35 rotate, the range overlapping with the suction port 33IN becomes smaller, and the outer teeth 341 and the inner teeth become smaller. A part of the portion where the gap between the 351 and the 351 gradually becomes smaller overlaps with the suction port 33IN. As a result, the amount of oil discharged per rotation of the input shaft 31 is reduced, that is, the discharge pressure of oil is lowered. On the contrary, when the internal pressure of the control oil chamber 41 becomes low, the adjusting ring 36 is displaced so that the volume of the control oil chamber 41 becomes small. As a result, the amount of oil discharged per rotation of the input shaft 31 increases, that is, the discharge pressure of oil increases.

Next, the oil control valve 21 will be described with reference to FIG.
The operation of the oil control valve 21 is controlled by an electronically controlled actuator 22. Oil is supplied to such an oil control valve 21 via a supply oil passage 23 connected to the discharge oil passage 52. Then, when the actuator 22 is driven to increase the internal pressure of the control oil chamber 41 of the oil pump 30, as shown in FIG. 3, in the oil control valve 21, the oil supplied through the supply oil passage 23 is the control oil. It operates so as to be supplied to the control oil chamber 41 via the passage 53. On the other hand, when the actuator 22 is driven to lower the internal pressure of the control oil chamber 41, as shown in FIG. 2, the oil control valve 21 puts the oil in the control oil chamber 41 into the oil control valve 21 to provide a control oil passage 53. It operates to flow in through. The oil that has flowed into the oil control valve 21 in this way is discharged to the oil pan 16 via the discharge oil passage 24.

Next, the control device 60 will be described with reference to FIG.
Detection signals are input to the control device 60 from various sensors such as the engine rotation speed detection sensor 71 and the oil temperature sensor 72. The engine rotation speed detection sensor 71 outputs a signal corresponding to the engine rotation speed NE, which is the rotation speed of the engine output shaft. The oil temperature sensor 72 outputs a signal corresponding to the oil temperature TMP, which is the temperature of the oil circulating in the internal combustion engine 10. Then, the control device 60 controls the oil discharge pressure POP in the oil pump 30, that is, the internal pressure of the control oil chamber 41, based on the information based on the detection signals from the sensors 71 and 72.

The control device 60 has a control unit 61 and an abnormal noise determination unit 62 as functional units.
The control unit 61 controls the internal pressure of the control oil chamber 41 in the oil pump 30 through the control of the actuator 22 of the oil control valve 21. That is, the control unit 61 controls the oil discharge pressure POP in the oil pump 30.

When the abnormal noise determination unit 62 controls the internal pressure of the control oil chamber 41 so that the discharge pressure POP of the oil in the oil pump 30 is included in the specified pressure region RP, an abnormal noise due to the pulsation of the discharge pressure POP is generated. Determine whether or not to do so. For example, the abnormal noise determination unit 62 can make the determination based on the oil temperature TMP and the engine rotation speed NE. The specified pressure region RP is set to a value lower than the maximum discharge pressure of oil in the oil pump 30 and higher than the minimum discharge pressure POPmin of oil.

Next, the above-mentioned abnormal noise will be described with reference to FIGS. 4 to 6.
The discharge pressure of the oil discharged from the oil pump 30 to the discharge oil passage 52 pulsates. Further, the internal combustion engine 10 includes a plurality of types of engine components arranged along the discharge oil passage 52. When the pulsation of the pressure of the oil flowing through the discharge oil passage 52 is large, at least some of the engine components arranged along the discharge oil passage 52 resonate depending on the cycle of the pulsation. Abnormal noise may occur due to the pulsation of the oil discharge pressure.

FIG. 4A shows a part of the oil pump 30 when the oil discharge pressure POP in the oil pump 30 is set to the maximum discharge pressure POPmax. When the discharge pressure POP is set to the maximum discharge pressure POPmax, the outer teeth 341 of the inner rotor 34 and the inner teeth 351 of the outer rotor 35 located between the discharge port 33OUT and the suction port 33IN in the operating chamber 37 come into contact with each other. ing. Therefore, the backflow of oil from the discharge port 33OUT to the suction port 33IN is suppressed by each of these teeth 341 and 351. As a result, the pulsation of the pressure of the oil discharged from the discharge port 33OUT is unlikely to increase.

FIG. 4B shows a part of the oil pump 30 when the oil discharge pressure POP in the oil pump 30 is set to the minimum discharge pressure POPmin. When the discharge pressure POP is set to a value lower than the maximum discharge pressure POPmax in this way, the outer teeth 341 of the inner rotor 34 and the inner teeth of the outer rotor 35 are between the discharge port 33OUT and the suction port 33IN in the operating chamber 37. The 351 may not come into contact with each other. If the teeth 341 and 351 do not come into contact with each other in this way, oil tends to flow back from the discharge port 33OUT to the suction port 33IN. As a result, the pulsation of the pressure of the oil discharged from the discharge port 33OUT tends to increase.

FIG. 5 shows the relationship between the magnitude of the pulsation of the oil discharge pressure POP under the condition that the engine rotation speed NE is held at a certain speed and the discharge pressure set value POPE which is the set oil discharge pressure. Is illustrated. When the magnitude of the pulsation of the discharge pressure POP is equal to or greater than the magnitude of the pulsation represented by the broken line L1 in FIG. 5, it can be determined that an abnormal noise caused by the pulsation of the discharge pressure POP is generated. That is, it can be determined that the abnormal noise may be transmitted to the occupants of the vehicle. On the other hand, if the magnitude of the pulsation of the discharge pressure POP is smaller than the magnitude of the pulsation represented by the broken line L1 in FIG. 5, it is not determined that an abnormal noise is generated due to the pulsation of the discharge pressure POP. That is, it is not determined that the abnormal noise may be transmitted to the occupant.

As is clear from FIG. 5, when the discharge pressure set value POPE is high, the pulsation of the oil discharge pressure POP is smaller than when the discharge pressure set value POPE is low, and it is determined that the above abnormal noise is generated. Not done.

When the region of the discharge pressure where it is determined that the abnormal noise is generated is the abnormal noise generation region R, the discharge pressure set value POPE is a value within the abnormal noise generation region R, and the oil discharge pressure POP is discharged. When the oil pump 30 is operating so that the pressure set value is POPE, the above-mentioned abnormal noise may be generated, and this abnormal noise may be heard by the occupants of the vehicle.

As a result of conducting various experiments and simulations, the present inventor has obtained the finding that the abnormal noise generation region R changes depending on the state of engine operation, that is, the oil temperature TMP and the engine rotation speed NE.

That is, the pulsation of the oil discharge pressure POP, that is, the cycle of the oil pressure pulsation flowing through the discharge oil passage 52 is synchronized with the engine rotation speed NE. That is, the cycle of the pulsation becomes shorter as the engine rotation speed NE increases. Therefore, whether or not the engine components resonate depends on the engine rotation speed NE.

Further, the viscosity of the oil decreases as the oil temperature TMP increases. Then, the propagation speed of the pulsation of the oil pressure to the engine component changes according to the viscosity of the oil, that is, the oil temperature TMP. Therefore, the ease of resonance of the engine component changes depending on the oil temperature TMP.

In FIG. 6, the abnormal noise generation region R when the oil temperature TMP is the first temperature TMP1 is represented by a solid line. Further, the abnormal noise generation region R when the oil temperature TMP is the second temperature TMP2 is represented by a alternate long and short dash line. Further, the abnormal noise generation region R when the oil temperature TMP is the third temperature TMP3 is represented by a broken line. The abnormal noise generation region R when the oil temperature TMP is the fourth temperature TMP4 is represented by the alternate long and short dash line. The second temperature TMP2 is higher than the first temperature TMP1, and the third temperature TMP3 is higher than the first and second temperatures TMP1 and TMP2. Further, the fourth temperature TMP4 is higher than the first to third temperatures TMP1 to TMP3. As shown in FIG. 6, the higher the oil temperature TMP, the narrower the abnormal noise generation region R.

The size and range of the abnormal noise generation region R vary depending on the model of the internal combustion engine to which the oil supply device 20 is applied. Therefore, by conducting experiments and simulations for each applied internal combustion engine, it is possible to set the abnormal noise generation region R according to the model.

Next, the processing routine executed by the control device 60 will be described with reference to FIG. 7. This processing routine is executed every predetermined control cycle.
In this processing routine, first, in step S11, it is determined whether or not the stop of oil injection by the oil jet 13 is required. If the stop of oil injection by the oil jet 13 is not requested (S11: NO), this processing routine is temporarily terminated. On the other hand, when it is requested to stop the oil injection by the oil jet 13 (S11: YES), the process proceeds to the next step S12.

Then, in step S12, whether or not an abnormal noise due to the pulsation of the discharge pressure POP is generated when the internal pressure of the control oil chamber 41 is controlled so that the oil discharge pressure POP is included in the specified pressure region RP. The determination is made by the abnormal noise determination unit 62. Specifically, the abnormal noise determination unit 62 derives an abnormal noise generation region R corresponding to the current oil temperature TMP and engine rotation speed NE based on the current oil temperature TMP and engine rotation speed NE (see FIG. 6). ). Then, the abnormal noise determination unit 62 determines that the abnormal noise is generated when the derived abnormal noise generation region R and the specified pressure region RP overlap. On the other hand, the abnormal noise determination unit 62 does not determine that the abnormal noise is generated when the specified pressure region RP does not overlap with the derived abnormal noise generation region R.

Then, in step S12, if it is not determined that the abnormal noise is generated (NO), the process proceeds to the next step S13. In step S13, the control unit 61 performs intermediate pressure control for adjusting the internal pressure of the control oil chamber 41 so that the oil discharge pressure POP is within the specified pressure region. Then, this processing routine is temporarily terminated.

On the other hand, if it is determined in step S12 that the abnormal noise is generated (YES), the process proceeds to the next step S14. In step S14, the control unit 61 performs full discharge control for adjusting the internal pressure of the control oil chamber 41 so that the oil discharge pressure POP becomes the maximum discharge pressure POPmax. Then, this processing routine is temporarily terminated.

The operation and effect of this embodiment will be described.
It is determined that if the oil discharge pressure POP is set to a value within the specified pressure region RP under the condition that the oil injection by the oil jet 13 is required to be stopped, an abnormal noise due to the pulsation of the discharge pressure POP is generated. When so, full discharge control is performed. In this case, the internal pressure of the control oil chamber 41 of the oil pump 30 is minimized, and the adjusting ring 36 is arranged at the initial position. As a result, the oil discharge pressure POP becomes the maximum discharge pressure POPmax, so that the magnitude of the pulsation of the oil discharge pressure POP discharged from the oil pump 30 can be reduced. As a result, it is possible to prevent the engine components arranged along the discharge oil passage 52 from resonating due to the pulsation of the oil discharge pressure POP. Alternatively, even if the engine components resonate due to the pulsation of the oil discharge pressure POP, the abnormal noise caused by the pulsation of the discharge pressure POP is unlikely to increase. As a result, it is possible to suppress the abnormal noise from being transmitted to the occupants of the vehicle.

On the other hand, under the condition that the oil injection by the oil jet 13 is required to be stopped, it is determined that an abnormal noise due to the pulsation of the discharge pressure POP is generated even if the oil discharge pressure POP is set to a value within the specified pressure region RP. When not, intermediate pressure control is performed. In this case, the oil discharge pressure POP becomes a value within the specified pressure region RP. Therefore, even when it is not determined that the abnormal noise is generated, deterioration of the fuel consumption of the internal combustion engine 10 can be suppressed as compared with the case where the full discharge control is performed. At this time, the pressure of the oil flowing through the jet supply path 14 becomes low, and the jet valve 15 is closed. As a result, oil is not injected from the oil jet 13. Further, even if the discharge pressure POP is set to a value within the specified pressure region RP in this way, the engine components arranged along the discharge oil passage 52 do not resonate due to the pulsation of the oil discharge pressure POP. Alternatively, even if the engine components resonate due to the pulsation of the oil discharge pressure POP, the abnormal noise is small and the abnormal noise is less likely to be transmitted to the occupants of the vehicle.

Therefore, in the present embodiment, it is possible to suppress the deterioration of the fuel efficiency of the internal combustion engine 10 and to reduce the discomfort to the occupants of the vehicle.

10 ... Internal combustion engine, 12 ... Piston, 13 ... Oil jet, 20 ... Oil supply device, 30 ... Oil pump, 41 ... Control oil chamber, 61 ... Control unit, 62 ... Abnormal noise determination unit.

Claims (1)

Applicable to internal combustion engines with oil jets that inject oil towards the pistons
It is equipped with an engine-driven oil pump that changes the oil discharge pressure by changing the internal pressure of the control oil chamber, and a control unit that controls the internal pressure of the control oil chamber.
When the control unit is required to stop the injection of oil by the oil jet, the control unit includes the discharge pressure of the oil in the oil pump within a specified pressure region which is a region of pressure lower than the maximum discharge pressure. In the oil supply device of an in-vehicle internal combustion engine that controls the internal pressure of the control oil chamber,
Whether or not an abnormal noise due to the pulsation of the oil discharge pressure is generated when the internal pressure of the control oil chamber is controlled so that the discharge pressure of the oil in the oil pump is included in the specified pressure region is determined by the oil. Equipped with an abnormal noise judgment unit that judges based on the temperature and engine rotation speed of
Even when the control unit is required to stop the injection of oil by the oil jet, the internal pressure of the control oil chamber is such that the discharge pressure of the oil in the oil pump is included in the specified pressure region. The internal pressure of the control oil chamber is controlled so that the discharge pressure of the oil in the oil pump becomes the maximum discharge pressure on condition that the abnormal noise determination unit determines that the abnormal noise is generated when the above is controlled. An oil supply device for an in-vehicle internal combustion engine.

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